Discharge head for grinding mills



Nqv. 24 @1925. 1,562,791

J. P. RUTH, JR

DISCHARGE HEAD FOP. GRINDING MILLS Filed April 10, 1923 JP/zu/zw Patented Nov. 24, 1925.

, assign PATENT OFFICE.

JOSEPH P. RUTH, JR., 6F DENVER, COLGRADU.

DISCHARGE HEAD FOE GRINDING IQITILLS.

Application filed April 10, 1923.

T (M to 7mm it may concern:

Be it known that I, Josnrrr P. RUTH, Jr., a citizen of the United States, and resident of the city and county of Denver, State 01 Colorado, have invented certain new and useful Improvements in Discharge Heads for Grinding Mills; and I do declare the following to be a1"*ull, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

The object of this invention is to provide a novel and highly serviceable construction of discharge head for grinding mills of the class generally known as rod mills, which will permit ready discharge of properly prepared pulp, prevent pulp from splashing out, retain the rods or other grinding media, and permit ready inspection of the interior when desired.

Briefly, the invention comprises a trust-oconical head for a mill having a journal i which is hollow for discharge of pulp there through and has a discharge flange. The journal is provided with a hollow liner secured therein, and at the inner end of the journal liner a battle or guard plate is positioned for discharge of pulp between the plateand the liner. The plate is preferably apert-ured at its middle but the opening therein has a smallerdiameter-than the diameter of thedischargeopening through said journal liner. Thus the baflie plate re tains rods which may be introduced-through said opening and also intercepts splash. *l-t desired a cap may be provided to cover said opening thusmaking the plate-solidin 'eifect during operationof the mill.

In the accompanying drawings, wherein certain embodiments of the invention are disclosed by way of illustration,

Fig. 1 is a vertical section through the end of a mill equipped with the present discharge head;

Fig. 2 is a face view from the outer side of the baffle plate;

Fig. 3 is an edge elevation of said plate with a portion broken away;

Fig. 4 is an edge elevation of the liner for the frusto-conical portion of the head with a part broken away;

Fig. 5 is a sectional detail showing a Serial No. 631,114.

is discharged from the mill, this liner 20.

being secured as by means of set screws 22. By loosening screws 22 liner may be readily removed from the journal 16 for easy access to the interior of the mill.

A battle plate or guard plate 24, which may be trusto-conical as shown, is mounted upon the inner end of the liner 20 and is there retained by bolts 25. Webs or blades 26 carried by plate 24 serve to space the plate from the end of the journal liner 20 and provide between them passages or channels 27 for the upward flow of pulp between the plate 24 and liner 20 so that the pulp may overflow the annular discharge lip 28 which constitutes the discharge opening of the mill and is defined by an annular flange on liner 20 in which flange the bolts are mounted for retention 01 plate 24. Baflle plate 24 has a central opening. 30 defined by an annular flange 311', and the blades 26 ma i terminate short .ofstheflangen l so asuto.

insure free discharge of pulp, as indicated at 29. Opening 30 permits. the insertion of rods into the mill andzins'pection of the mill, the, plate 24 insuringretention of the rods and interceptingsplash- The diameter, oi the battle plate24 is'greater. than that of the discharge opening 28 so as to cause the pulp being discharged to flow at least partially from points below the pulp level indicated by line a, the said diameter of plate 24 being suiiiciently less than the internal diameter of journal 16 to permit baii'ieplate 24 to be removed with the journal liner 20. The channels 27 are alined with short channels 32 in the ring liner 18.

To the outer end of the journal 16 there is bolted a discharge flange 35 as seen at 86, over which the pulp flows as it leaves the liner 20. Flange 35 preferably is frusto-oonical as shown and has its base provided with an exterior annular flange or rim 38 which serves to intercept any pulp which runs down the outer faceof the discharge flange 35 as such pulp which clings to the lip of flange 35 is carried upward during rotation of the mill. In this manner the rim 38 keeps the pulp out of the bearings at 17 and insures long life thereof.

If it is desired to close the end of the mill entirely during operation, a cap 40 may be provided for placing over the opening 30 of the baffle plate. Thus any probability of splashing of pulp from the mill will be prevented. This cap 40 may have an annular friction flange 42 for engaging the inner wall of the part 31 to retain the cap, as in Fig. 5, or it may be secured to the plate 24k by means of machine screws as seen in Fig. 6. In both instances the cap 40 may be provided with a handle 44. a

In operation the pulp level indicated by line a will be determined by the discharge opening 28 in journalliner 20, the pulp flowing from the interior of the mill through the channels 32 in ring liner 18 and channels 27 between batl'le plate 2% and the end of liner 20. \Vhe'n the cap 40 is removed, rods may be introduced through opening 30 into the mill and the interior may be inspected. The frustoconical form of the baffle plate 2% will insure return of the rods into the mill should they work outward during the tumbling movement thereof. By loosening the set screws 22, the liner 20 and baffle plate 24: may be removed for access to the interior of the mill and removal of rods therefrom.

I claim:

1. In a grinding mill, a head having a journal, a liner for said journal and a baffle plate secured on the inner end of. the liner, the liner and plate being removable together from said journal at its outer end- 2. In a grinding mill, a head having a hollow journal, a liner in said journal and removable therefrom, and a baffle plate see cured on the inner end of said liner and spaced slightly therefrom axially of the mill.

3. In a grinding mill, a head having a hollow journal, a liner in said journal, the head having a frusto-conical portion connecting the journal with the mill, and a frusto-conical bafile plate secured to the inner end of the liner and removable from the mill with the liner.

4. In a grinding mill, a head having a hollow journal, a liner in said journal whose smallest internal diameter determines the discharge opening from the mill, and a baffie plate secured to the inner end of the liner and spaced therefrom, the diameter of the plate being greater than the diameter of the discharge opening.

5. In a grinding mill, a discharge head having a hollow journal, a liner removably mounted in said journal, the smallest internal diameter of the liner determining the discharge opening from the mill, and a baffle plate secured to the inner end of the liner and spaced therefrom, the diameter of the plate being greater than that of the discharge opening and less than that of the interior of the journal, whereby the baffle plate may be removed with the liner.

6. In a grinding mill, a discharge head having a hollow journal, a liner in said journal whose smallest internal diameter determines the discharge opening from the mill, and a bai'ile plate secured onthe inner end of the liner having a diameter greater than that of the opening and having an opening at its center of smaller diameter than the discharge opening, said plate being removable with the liner from the outer end of the journal.

7. In a grinding mill, a discharge head having a frusto-conical portion and a journal extending from said portion, the journal being hollow, a liner for said frustoconical portion, a liner in said journal having a discharge opening therethrough, and a baffle plate secured to the inner end of. the liner and spaced therefrom, the plate having a diameter greater than that of said opening and extending toward the center over at least a portion of said opening, channels being provided between the plateand the end of the journal liner for the passage of pulp, the liner for the frusto-conical portion of the head having passages therein alined with the channels.

In testimony whereof I afiix my signature.

Joe. P. RUTH, JR. 

